Chapter 9 Test Flashcards
Another name for voluntary muscle is
both striated and skeletal
Intercalated disks are found in
Cardiac muscle
This type of muscle tissue contains striations
Voluntary and cardiac
Another name for visceral muscle is
Smooth muscle
In the flexing of the elbow
The biceps brachia is the prime mover
In extending the elbow
The triceps brachii is the prime mover
The triceps brachii and the biceps brachii
Are antagonists to each other
The movement that is opposite of flexion is
Extensions
Which of the following muscles is described as striated and involuntary?
Cardiac
Actin is
a contractile protein that is called a thin filament
Which of the following forms cross bridges with actin
Myosin
Which muscles are located between the ribs and help the rib cage during breathing
intercostal muscle
What is the name of the cord of connective tissue that connects muscle to bone?
Tendon
Which of the following is a series of contractile units that make up each myofibril; each unit extend from Z line to Z line?
Sarcomere
This structure is an extension of the sarcolemma or cell membrane; it penetrates the interior of the muscle and carries the electrical signal to the deepest part of the muscle
T tubule
The sarcoplasmic reticulum
Envelopes the sarcomere containing myofibrils
What is the site of calcium storage in a relaxed skeletal muscle?
Sarcoplasmic reticulum
Acetylcholine is released in response to the
Nerve impulse
Which of the following is responsible for muscle relaxation
Calcium is pumped back into the sarcoplasmic reticulum
The rectus, transverses, internal oblique, and the external oblique refer to
Abdominal muscles
With regards to skeletal muscle contraction, which event comes first
Release of neurotransmitter from the somatic motor neuron
T/f: Both smooth muscles and cardiac muscles have striations
False
T/f: Both cardiac muscles and skeletal muscles have interrelated disks
False
T/f: Unlike skeletal muscles, smooth muscle cells have only one nucleus
True
T/f: Skeletal muscles are also called striated or visceral muscles
False
T/f: Tendons attach bone to bone
False
T/f: Tendons attach muscle to bone at both the origin and insertion sites
True
T/f: The thick myofilaments in a skeletal muscle are composed of actin
False
T/f: The thin myofilaments in a skeletal muscle are composed of actin
True
T/f: Another name for a muscle cell is a muscle fiber
True
T/f: The model that is used to explain how a muscle contracts is called the sliding filament model
True
T/f: Sarcomeres are separated from each other by dark bands called myofilaments
False
T/f: During a muscle contraction, the Z lines of that muscle come closer together
True
T/f: Both calcium and ATP are needed for a muscle to contract
True
T/f: When the elbow is straightened, the triceps brachii becomes the antagonistic muscle
False
T/f: A muscle can be a prime mover or an antagonist depending on the movement of the joint
True
T/f: Muscle tone maintains posture
True
T/f: All the motor neurons that stimulate a single muscle are referred to as a motor unit
False
T/f: Chemicals are released at the neuromuscular junction that stimulate the muscle to contrat
True
T/f: If a prime mover causes extension, the antagonist would cause flexion
True
This protein makes up the thick myofilament
Myosin
This is another name for smooth muscle
Visceral muscle
These structures are only found in cardiac muscles
Intercalated disks
These structures separate one sarcomere from another
Z line
This protein makes up the thin myofilament
Actin
This is usually the non moving attachment point of a muscle
Origin
This is another term for skeletal muscle
Voluntary muscle
This is usually the moving attachment point of a muscle
Insertion
This is the functional unit of contraction of a skeletal muscle
Sarcomere
Explain the microscopic structure of the skeletal muscle
The skeletal muscle contains sarcomeres that contain myosin and actin that contract when the muscle moves.
Explain the roles of the prime mover, the synergist and the antagonist in muscle contraction
Prime mover- muscle that does majority of the work
Anatagonist- does opposite of prime mover
Synergist- help the prime mover
